Abstract
‘‘Bad metals” are known to have a large linear resistivity at high that is universally seen near the Mott-Hubbard insulating phase. Less well known is that the thermopower of the Mott-Hubbard systems also exhibits simple universal features: (i) close to the insulating phase, where the resistivity has a low-temperature upturn, has a pronounced low- peak that shifts to higher with doping; (ii) when the resistivity is nearly linear, which occurs at moderate doping, has a small low- peak that shifts to lower with doping and has a high- sign change; and (iii) at the highest doping, where the resistivity acquires a term, is negative and depends monotonically on . The universality can be understood using the Kelvin formula and the fact that the chemical potential for doped Mott insulators displays similar behavior at high . The universality is illustrated with the exact solution of the simplest model for a doped Mott insulator at high .
- Received 17 July 2013
- Revised 28 February 2014
DOI:https://doi.org/10.1103/PhysRevB.89.155101
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